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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 16/19] OvmfPkg/XenBusDxe: Add Event Channel into XenBus protocol.
This patch adds three event channel related functions:
- EventChannelAllocate: Allocate an event channel port that can be bind
from a specified domain.
- EventChannelNotify: Send an event to the remote end of a channel.
- EventChannelClose: Close a local event channel port.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Change in V3:
- eventchannel, update protocol to return error code.
- expand patch description
- Add comments in the XenBus Protocol header.
Change in V2:
- coding style
- adding comment to functions
- Rename Xenbus to XenBus.
---
OvmfPkg/Include/Protocol/XenBus.h | 53 +++++++++++++++++++++++++++++++++++++
OvmfPkg/XenBusDxe/EventChannel.c | 55 +++++++++++++++++++++++++++++++++++++++
OvmfPkg/XenBusDxe/EventChannel.h | 52 ++++++++++++++++++++++++++++++++++++
OvmfPkg/XenBusDxe/XenBus.c | 3 +++
4 files changed, 163 insertions(+)
diff --git a/OvmfPkg/Include/Protocol/XenBus.h
b/OvmfPkg/Include/Protocol/XenBus.h
index e54077d..c85c928 100644
--- a/OvmfPkg/Include/Protocol/XenBus.h
+++ b/OvmfPkg/Include/Protocol/XenBus.h
@@ -79,6 +79,7 @@ typedef enum {
#include <IndustryStandard/Xen/grant_table.h>
+#include <IndustryStandard/Xen/event_channel.h>
///
/// Function prototypes
@@ -266,6 +267,54 @@ EFI_STATUS
);
/**
+ Allocate a port that can be bind from domain DomainId.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param DomainId The domain ID that can bind the newly allocated port.
+ @param Port A pointer to a evtchn_port_t that will contain the newly
+ allocated port.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+typedef
+UINT32
+(EFIAPI *XENBUS_EVENT_CHANNEL_ALLOCATE) (
+ IN XENBUS_PROTOCOL *This,
+ IN domid_t DomainId,
+ OUT evtchn_port_t *Port
+ );
+
+/**
+ Send an event to the remote end of the channel whose local endpoint is Port.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param Port Local port to the the event from.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+typedef
+UINT32
+(EFIAPI *XENBUS_EVENT_CHANNEL_NOTIFY) (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ );
+
+/**
+ Close a local event channel Port.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param Port The event channel to close.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+typedef
+UINT32
+(EFIAPI *XENBUS_EVENT_CHANNEL_CLOSE) (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ );
+
+/**
Register a XenStore watch.
XenStore watches allow a client to wait for changes to an object in the
@@ -361,6 +410,10 @@ struct _XENBUS_PROTOCOL {
XENBUS_GRANT_ACCESS GrantAccess;
XENBUS_GRANT_END_ACCESS GrantEndAccess;
+ XENBUS_EVENT_CHANNEL_ALLOCATE EventChannelAllocate;
+ XENBUS_EVENT_CHANNEL_NOTIFY EventChannelNotify;
+ XENBUS_EVENT_CHANNEL_CLOSE EventChannelClose;
+
XENBUS_REGISTER_WATCH RegisterWatch;
XENBUS_REGISTER_WATCH_BACKEND RegisterWatchBackend;
XENBUS_UNREGISTER_WATCH UnregisterWatch;
diff --git a/OvmfPkg/XenBusDxe/EventChannel.c b/OvmfPkg/XenBusDxe/EventChannel.c
index 5d57f69..48f66fa 100644
--- a/OvmfPkg/XenBusDxe/EventChannel.c
+++ b/OvmfPkg/XenBusDxe/EventChannel.c
@@ -31,3 +31,58 @@ XenEventChannelNotify (
ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
return ReturnCode;
}
+
+UINT32
+EFIAPI
+XenBusEventChannelAllocate (
+ IN XENBUS_PROTOCOL *This,
+ IN domid_t DomainId,
+ OUT evtchn_port_t *Port
+ )
+{
+ XENBUS_PRIVATE_DATA *Private;
+ evtchn_alloc_unbound_t Parameter;
+ UINT32 ReturnCode;
+
+ Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
+
+ Parameter.dom = DOMID_SELF;
+ Parameter.remote_dom = DomainId;
+ ReturnCode = XenHypercallEventChannelOp (Private->Dev,
+ EVTCHNOP_alloc_unbound,
+ &Parameter);
+ if (ReturnCode != 0) {
+ DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d",
ReturnCode));
+ return ReturnCode;
+ }
+ *Port = Parameter.port;
+ return ReturnCode;
+}
+
+UINT32
+EFIAPI
+XenBusEventChannelNotify (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ )
+{
+ XENBUS_PRIVATE_DATA *Private;
+
+ Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
+ return XenEventChannelNotify (Private->Dev, Port);
+}
+
+UINT32
+EFIAPI
+XenBusEventChannelClose (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ )
+{
+ XENBUS_PRIVATE_DATA *Private;
+ evtchn_close_t Close;
+
+ Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
+ Close.port = Port;
+ return XenHypercallEventChannelOp (Private->Dev, EVTCHNOP_close, &Close);
+}
diff --git a/OvmfPkg/XenBusDxe/EventChannel.h b/OvmfPkg/XenBusDxe/EventChannel.h
index da17346..9891951 100644
--- a/OvmfPkg/XenBusDxe/EventChannel.h
+++ b/OvmfPkg/XenBusDxe/EventChannel.h
@@ -33,4 +33,56 @@ XenEventChannelNotify (
IN evtchn_port_t Port
);
+/*
+ * XenBus protocol
+ */
+
+/**
+ Allocate a port that can be bind from domain DomainId.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param DomainId The domain ID that can bind the newly allocated port.
+ @param Port A pointer to a evtchn_port_t that will contain the newly
+ allocated port.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelAllocate (
+ IN XENBUS_PROTOCOL *This,
+ IN domid_t DomainId,
+ OUT evtchn_port_t *Port
+ );
+
+/**
+ Send an event to the remote end of the channel whose local endpoint is Port.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param Port Local port to the the event from.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelNotify (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ );
+
+/**
+ Close a local event channel Port.
+
+ @param This A pointer to the XENBUS_PROTOCOL.
+ @param Port The event channel to close.
+
+ @retval UINT32 The return value from the hypercall, 0 if success.
+**/
+UINT32
+EFIAPI
+XenBusEventChannelClose (
+ IN XENBUS_PROTOCOL *This,
+ IN evtchn_port_t Port
+ );
+
#endif
diff --git a/OvmfPkg/XenBusDxe/XenBus.c b/OvmfPkg/XenBusDxe/XenBus.c
index e595767..9ac654d 100644
--- a/OvmfPkg/XenBusDxe/XenBus.c
+++ b/OvmfPkg/XenBusDxe/XenBus.c
@@ -359,6 +359,9 @@ STATIC XENBUS_PRIVATE_DATA gXenBusPrivateData = {
.XenBusIo.SetState = XenBusSetState,
.XenBusIo.GrantAccess = XenBusGrantAccess,
.XenBusIo.GrantEndAccess = XenBusGrantEndAccess,
+ .XenBusIo.EventChannelAllocate = XenBusEventChannelAllocate,
+ .XenBusIo.EventChannelNotify = XenBusEventChannelNotify,
+ .XenBusIo.EventChannelClose = XenBusEventChannelClose,
.XenBusIo.RegisterWatch = XenBusRegisterWatch,
.XenBusIo.RegisterWatchBackend = XenBusRegisterWatchBackend,
.XenBusIo.UnregisterWatch = XenBusUnregisterWatch,
--
Anthony PERARD
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